That would be great if it works for XP ect. I will have to give it a try in a few days. What kind of machine are you running? I have a bunch of VC1 m2ts files that I would like to watch but have had this problem.

Your solution should work in WinXP, after all mencoder.exe does not have that much a specific windows dependent code.

I believe VC1 problem is related to WMV Pro encoding, its closed source implementation. Opensource projects have been trying to reverse engineer it, some succeeded some failed, some implementations lack features. I think this summer 2009 came to light first real implementations to run VC1/WMAPro videos, so expect to see it in FFDSHOW package sometime later.

MPlayer project has always been good at supporting vc1 pro implementations, its what I use to batch convert all VC1 wmv videos to widely supported avc/aac files.